Has anyone mounted an HF antenna on an Avalanche yet, these things have so much plastic it is difficult to find a good spot for my Hamstick antennae, I really don't want to chop into steel, but am at a loss as to what to do, any suggestions???

Have you considered a 2"x2" piece of angle across and level with the back bumper? You can use the trailer hitch receiver to hold a custom welded receiver bar; drill the angle iron on each end and add two 3/8-24 mounts with quick disconnects and with coax pigtails on them just long enough to get inside the SUV/truck. (Drill and tap the angle iron for a #10 stainless machine screw for a ground strap near the receiver...you may or may not need it.) Then you can put any type antenna back there; two of them.

When you need to haul a trailer just unscrew the coax pigtail cables, quick disconnect the antennas and remove the receiver bar.

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